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{-# LANGUAGE ForeignFunctionInterface #-}
-- $ ghc -O2 --make wrappers.hs functions.c
import Numeric.LinearAlgebra
import Data.Packed.Development
import Foreign(Ptr,unsafePerformIO)
import Foreign.C.Types(CInt)
-----------------------------------------------------
main = do
print $ myDiag $ (3><5) [1..]
-----------------------------------------------------
-- arbitrary data order
foreign import ccall "c_diag"
cDiag :: CInt -- matrix order
-> CInt -> CInt -> Ptr Double -- argument
-> CInt -> Ptr Double -- result1
-> CInt -> CInt -> Ptr Double -- result2
-> IO CInt -- exit code
myDiag m = unsafePerformIO $ do
y <- createVector (min r c)
z <- createMatrix (orderOf m) r c
app3 (cDiag o) mat m vec y mat z "cDiag"
return (y,z)
where r = rows m
c = cols m
o = if orderOf m == RowMajor then 1 else 0
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